[patch] updated reset handling

[Adrian Chadd]

Hi,

This patch introduces all the missing locking/serialisation to
(hopefully) ensure the reset and channel change paths are handled
correctly.
This fixes all of the throughput issues that occur during an interface reset.

I'm not going to push it into -HEAD until I've done a lot more testing
(read: more than just one station and one access point.) I'd thus like
to hear feedback from the 11n testers I have out there.

Thanks,


Adrian
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